著者

岡本 明夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.100, no.1160, pp.913-917, 1984-10-25 (Released:2011-07-13)

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(1) 名称釈迦内鉱山株式会社釈迦内鉱山(2) 所在地秋田県大館市釈迦内字二ツ森三八郵便番号017電話0186 (48) 2141(3) 鉱種金, 銀, 銅, 鉛, 亜鉛, 硫化鉄鉱, 重晶石, 石こう(4) 位置・交通釈迦内鉱山は, 秋田県大館市釈迦内字二ツ森38に事務所があり, 奥羽本線大館駅より国道7号線を北に約5kmの地点にある。(第1図)(5) 地形・気候本鉱山は大館盆地北端部に位置し, 局部的に石英安山岩体よりなる丘陵が点在するほか, 概して平担であり, 地表の多くは耕作地となつている。気候的には寒冷であり, 11月末-3月初旬は降雪期であるが, 積雪量は1m前後である。

著者

奥寺 俊暉 関本 英弘

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.139, no.1, pp.1-9, 2023-01-31 (Released:2023-01-31)

参考文献数

34

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Surface morphology of lead deposits from H2SiF6-PbSiF6 electrolyte containing an animal glue was investigated by means of the periodic galvanostatic electrolysis and SEM-EDS observation. The weight average molecular weight of the glue was also determined with the static light scattering measurement. The temporal changes of the overpotential and the weight average molecular weight were discussed in terms of the elapsed time after preparing the electrolyte which contained 100 g∙L−1 of H2SiF6 and 100 g∙L−1 of Pb(II) and in which the initial concentration of the glue (Cglue) was 0–10.0 g∙L−1. The dendritic growth of lead deposits was observed from the electrolyte of Cglue = 0 g∙L−1 in the galvanostatic electrolysis where the cathodic current density and the electrolyte temperature was −150 A∙m−2 and 40 ℃, respectively. Smooth and dense lead deposits were obtained in the electrolyte of Cglue = 0.5–5.0 g∙L−1 when the elapsed time τ = 0 d. The surface of the deposits gradually became rough with increasing τ in the electrolyte of Cglue = 0.1–1.0 g∙L−1. On the other hand, nodules or bearded deposits were observed on the deposits obtained in the electrolyte of Cglue = 5.0 g∙L−1 when τ = 1–2 d. After this, the surface became smooth with the further increase of τ. The change of the weight average molecular weight of the glue (Mr,w) with τ was described with the equation, 1/(Mr,w)τ = 1/(Mr,w)0 + k′τ, in the electrolyte containing 100 g∙L−1 of free H2SiF6 and 100 g∙L−1 of Pb(II) at 40 ℃. The k′ value was evaluated to be 5 × 10−9 min−1 in the electrolyte of Cglue = 1.0 g∙L−1 and 6 × 10−9 min−1 in the electrolyte of Cglue = 10.0 g∙L−1.

著者

吾妻 潔

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.91, no.1051, pp.607-609, 1975-09-25 (Released:2011-07-13)

参考文献数

15

著者

村上 義雄 山口 寿々男 伊東 賢治 大坪 泰典

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.101, no.1164, pp.67-73, 1985-02-25 (Released:2011-07-13)

参考文献数

7

被引用文献数

1 1

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Through analysis of the data obtained from the plant test in the Kamioka-Shikama concentrator, which includes a 2, 700mm dia.×3, 600mm length rod mill and a 3, 900mm dia.×5, 700mm length ball mill in a closed circuit with 2 or 3 hydrocyclones of 600mm in diameter, a comminution mathematical model has been deduced from making use of a selection function under the assumption of plug flow material transport. ln the rod mill, the said selection function “s (x) =Kx” is 1.871×10-4x0.7151 (s-1) and that in the ball mill is 1, 179×10-5x0.9891 (s-1).As a cyclone classification-model, the logarithmic cumulative normal distribution function has been found to give a best fit to the true partition curve. Several regression equations for the prediction of the fraction of water β, separation size D50, and the sharpness of σ separation a have been made up as the functions of the feed to the cyclone. Combining the mill models with those regression classification models, many simulations have been carried out to find out the most accurate cyclone model to be applied for simulating the real operation.Making use of the optimum models, the comminution in the mills and classification in the cyclones have been simulated in a wide range of operating conditions to obtain information on the conditions of the plant. The results of the simulations indicate that it is possible to gain higher throughput in the mill-cyclone circuit without changing the characteristics of the cyclone overflow (i. e. the feed to the flotation circuit).

著者

赤塚 真依子 玉村 修司 五十嵐 敏文 金子 勝比古

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.131, no.7, pp.459-464, 2015-07-01 (Released:2015-07-01)

参考文献数

30

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As one of the application of coal resources, domestic and overseas industries have been focusing on the recovery of methane from coal resources by methanogens using low-molecular weight acids or hydrogen that are converted from the organic matter in coal. For this application, it is essential to enhance the extraction of organic matter from low-rank coal (lignite) and maximize the conversion rate to consumable substrates for methanogen. In this study, we focused on the effects of chelating and reducing agents on the extraction of organics and metals from low-rank coal. Citric acid (chelating and reducing agent) and EDTA (chelating agent) were chosen as typical solvents. In the presence of citric acid, the Fe (II) concentration was correlated with the concentration of extracted organics as well as the total Fe. By contrast, the Fe (II) concentration was constantly at a low level for each EDTA concentration and pH. The absorbance (280 nm) of both solutions was almost the same when the total Fe concentrations were similar, regardless of the concentrations of Fe (II) , Al, Mg and Ca. These results indicated that organics from lignite were extracted with the leaching of Fe (III) and that the effects of reduction on the extraction of organics were insignificant. Excitation emission matrix spectra analysis suggested that humic acid was the main component of the extracted organics from lignite. The amount of acetic acid and formic acid released from 1g of lignite was calculated to be in the range 0.14 to 0.25 mg, and it was observed no correlation of the released amount with the citric acid /EDTA concentrations. Further research to obtain substrates such as low-molecularweight acids from the extracted organic materials is necessary for methane production using methanogens.

著者

国枝 鋭二

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.84, no.963, pp.935-939, 1968-07-25 (Released:2011-07-13)

著者

正路 徹也 小林 祥一 孟 憲国 金田 博彰

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.112, no.10, pp.683-687, 1996-09-25 (Released:2011-01-27)

参考文献数

2

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The availability of GPS (Global Positioning System) has been examined in three areas. The first is a fixed point on the roof of a building of the University of Tokyo. The second area is around the Hishikari gold mine, southwestern Japan. The area was selected because topographic maps (1/25, 000) are published. The topography consists of gentle hills. The third area is Yunnan Province, southwestern China, where foreigners are prohibited to use topographic maps. The surveyed area is mostly mountainous. Measured values at the fixed point are scattered within 100m from the true position. The average point is located 30m south from the true position. In the Hishikari area, each GPS value is compared with the coordinates given by a topographic map. The deviation between the GPS value and the coordinates is within 300m. The reason why the deviation is larger than the error at the fixed point is that the coordinates given by a map includes error. In Yunnan, the accuracy was checked by the reproducibility. At many sites, satellites were not found because of steep slopes and high trees. A relatively wide space was located, however, within 300m from each site. When 4 satellites were found in wide areas, values were scattered in a circle with a diameter of 200m. When 4 satellites were found in narrow areas, the diameter was 500m. When only 3 satellites were found, the diameter was 1, 000m. These values are larger than the error of the pacing (less than 10 m for 100m distance). The result suggests that the GPS can provide location data with the accuracy enough to geoscience discussions in regional scales.

著者

西岡 宣泰 甲斐 匠 岡本 将裕 武部 博倫

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.12, pp.170-178, 2022-12-30 (Released:2022-12-23)

参考文献数

20

被引用文献数

1

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A hand-made apparatus to react copper concentrate (Cc)/pyrite (Py)/silica sand (Ss) mixture was developed for an imitated concentrate burner at laboratory scale. An instantaneous (< 1 s) ignition reaction was macroscopically observed by preheated oxygen gas blowing to Cc/Py/Ss mixture with a Fe/SiO2 mass ratio of 1.1. SEM-EDS analysis was used to observe microstructure and phase distribution in reacted and water-quenched particles. As for the Cc/Ss samples collected at the point close to the gas blowing spot, 70–80 mass% Cu matte phase and heterogeneous slag phase including large amounts of magnetite (Mag) particles were formed. At the lower part from the gas blowing spot with a distance of 275 mm, 60–65 mass% Cu matte phase was confirmed. The area fraction of Mag particles in the slag phase decreased with increasing Py adding concentration in the mixture sample. Our results suggested the concentration and microscopic distribution of Py in the mixture including Cc contributed to control both Cu concentration in matter phase and Mag particle concentration in slag phase.

著者

長谷川 熊彦

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.27, no.312, pp.129-140, 1911-02-28 (Released:2011-07-13)

著者

淵田 茂司 田嶋 翔太 所 千晴

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.11, pp.160-169, 2022-11-30 (Released:2022-11-25)

参考文献数

24

被引用文献数

1

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This study examined effective removal methods for high amounts of manganese (Mn) and zinc (Zn) in acid mine drainage (AMD) by addition of different neutralizing agents (NaOH and NaClO) and synthesized birnessite (δ-MnO2) using two-type AMD samples which Mn and Zn concentrations were 778 and 410 mg L−1 for A mine and 18.0 and 5.51 mg L−1 for B mines, respectively. The precipitation mechanism of these metal ions was investigated by geochemical modeling (PHREEQC) and X-ray absorption near edge structure (XANES) analysis. Mn concentrations were below the effluent standard (10 mg L−1) at pH 9–10 with the NaOH neutralization, whereas it was accomplished at lower pH (6–7) condition with the NaClO addition; it could act as an oxidizing agent, resulting that most of Mn precipitated as δ-MnO2. Zn concentrations decreased below the effluent standard (2 mg L−1) at pH 8–9 using both neutralizing agents. XANES analysis results indicated Zn was removed by the surface complexation formation on manganite and δ-MnO2 surface. More effective removal of Mn and Zn from AMD was found around pH 6 when a sufficient amount of δ-MnO2 was added to both AMD before the NaOH neutralization; a geochemical model coupling charge distribution multisite ion complexation revealed the triple-corner-sharing on δ-MnO2 was the most reasonable mechanism. Our result suggests that the presence of sufficient δ-MnO2 was the most effective for high Mn and Zn contents AMD treatment; however, ferrous ion (Fe2+) can inhibit the adsorption reaction and decompose δ-MnO2. Thus, pre-precipitation of Fe2+ is required to enhance the effect of δ-MnO2 on Mn and Zn removals from AMD.

著者

山田 正幸 馬場 文夫

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.73, no.834, pp.861-865, 1957-12-25 (Released:2011-07-13)

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In the most recent we have been interested in keep away from an explosion accident by the misfired detonstors. In this paper we shall report on the electronic metal detection.The metal detector is build around some form of mutual-inductance bridge employing a symmetrical coil arrangement which is bed by a suitable oscillator. The presence of a metallic particle in the A. C. electro-magnetic field which links the coils disturbs the original field pattern for which the bridge was balanced. The resulting bridge unbalance current is amplified and made to operate a warning or rejection device.

著者

大西 知華 吉福 秀斗 武部 博倫

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.9, pp.143-148, 2022-09-30 (Released:2022-09-30)

参考文献数

17

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Copper slag (CS) granules received from a Japanese smelter were melted using an alumina crucible under Ar gas flow in an electric furnace. The melt was removed from the furnace and cooled slowly with various holding times in air and then water-quenched. The increase of cooling time in air promoted the partial crystallization of CS samples: the separation of Fe-rich and Si-rich phases, the precipitation of fayalite and magnetite phases and the formation of Al2O3- and SiO2-rich non-crystalline aluminosilicate phase. The CS melt was subdivided into smaller ones through a hand-made yttria-doped stabilized zirconia polycrystal sieve and repelled by a rotational graphite plate. After cooling crystallized CS granules were successfully fabricated. The crystallized CS granules including fayalite and magnetite phases satisfied a lower limit for the elution amounts of As and Pb fixed as ≤150 mg/kg in 1 mol/L HCl aqueous solution as specified in the guideline of JIS 0058-2:2005 as a test method for acid-extractable contents of chemicals.

著者

国吉 実 村上 次雄 溝田 忠人

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.118, no.3,4, pp.191-196, 2002 (Released:2006-01-31)

参考文献数

10

被引用文献数

3 3

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Sodium bicarbonate is so unstable that the rate of decomposition is strongly affected by even trace amount of water in the powder. Variously hydrated species may be formed on the surface as decomposition products from sodium bicarbonate to sodium carbonate. In order to clarify the decomposition-mechanism and chemical-stability of the material, a method of quantitative analysis has necessarily been developed to determine the minute amount of free water and crystalline water related to variously hydrated salts. Preceded to the present work, therefore, four analytical methods established so far were examined to select the suitable method for the present object. The Karl-Fischer titration method combined with a moisture evaporator was finally selected by adding an analytical process, in which the dehydration amount-time profile is deconvoluted into several different peaks corresponding to the state of water. The fractional evaporation of various states of water enables the quantitative analysis without any pretreatment of the sample. This fractional quantitative analysis may be explained by the difference of thermal-stability among those of sodium bicarbonate, sodium carbonate hydrate and sodium sesquicarbonate.

著者

井関 隆士 小林 純一 高橋 純一

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.8, pp.129-133, 2022-08-31 (Released:2022-08-25)

参考文献数

14

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As pyrometallurgical technologies to smelt nickel metal from the oxide ore, melting reduction process using an electric furnace (Elkem) and semi-melting reduction process using a rotary kiln (Krupp-Renn) with a saprolite ore as a raw material have been established and operated commercially. However, in the future, it is expected that it will be difficult to smelt nickel from the oxide ore because of the decline of nickel grade in the ore and it is necessary to develop a new process adaptable to lower grade ore and difficult processing ore.The authors have conducted fundamental research on the pyrometallurgical reaction of low grade and difficult processing nickel oxide ore smelting by the rotary hearth furnace (RHF). Liquefied gas burner will be supposed from points of cost, reduction of global warming gas and so on in the operation of Ni smelting. On the other hand, it is getting clearer that Fe and Ni metallization degree in liquefied gas burning atmosphere are lower than those in N2 atmosphere. The reason have been guessed effects of H2O generating in liquefied gas combustion. The results about effects of H2O to reduction reaction of low Nickel grade oxide ore is described in this report.

著者

永崎 靖志

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.112, no.6, pp.360-364, 1996-05-30 (Released:2011-01-27)

著者

谷口 和矢 松本 章邦 縄田 和満

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.129, no.10_11, pp.642-649, 2013-10-01 (Released:2014-11-01)

参考文献数

27

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On Feburuary 22, 2012, the WTO case of China's export restrictions on raw materials was settled as the Appellate Body report was adopted. The report decided that China's export restraints were inconsistent with its commitments under several agreements.This was the first case that the Appellate Body made a judgement on a case dealing with export restrictions. This paper examines effects of the WTO dispute settlement process for this case using the metal price data. We first review the WTO dispute settlement process and a brief history of the China's export restrictions case. This WTO case is important by two reasons. First, the WTO had been mainly dealing with import restrictions that might prevent smooth trade between nations. Secondly, the targeted commodities were mineral resources neccessary for the wide range of manufactural products. Hence the judgement would probably give a significant impact on many industries. Then, we evaluate the effects of the WTO dispute settlement process by event studies of alminium and zinc prices. We find that the alminium price is not affected, however, the zinc price fell down when the Appellate Body report was adopted. The results of alminium and zinc suggest that the effect of the WTO dispute settlement process might depend on the difference of the production shares of China.

著者

藤井 孝志 菅井 裕一 佐々木 久郎 橋田 俊之 當舎 利行 中尾 信典

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.129, no.12, pp.701-706, 2013-12-01 (Released:2014-12-01)

参考文献数

17

被引用文献数

1 1

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Understanding of interfacial interactions among supercritical CO2 (scCO2), water, and mineral phase is necessary for a precisely prediction of CO2 migration into aquifers. The purpose of this study is to assess the impact of scCO2 on flow property of Kimachi sandstone and Iidate granite in a CO2 rich dense phase i.e., the condition of which scCO2 is expected to displace formation water in the course of CO2 injection. In this experiment, the permeability test for CO2 gas was conducted before and after a CO2 saturation procedure that is filled with scCO2 in pores of rocks. To investigate a mechanical property of rock specimen in the presence of scCO2, the axial strain was also measured using a laser displacement sensor during scCO2 saturation processes. Our results showed that both Kimachi sandstone and Iidate granite samples tested have a more or less decreasing trend of gas permeability with increasing exposure time to scCO2. It was further shown that the axial strain of Kimachi sandstone and Iidate granite increased as scCO2-exposure time increased. Additionally, increases in masses and dimensions of test samples before and after scCO2 saturation processes were clearly observed under atmospheric pressure conditions. It can, therefore be said that Kimachi sandstone and Iidate granite could be capable of swelling and permeability change accompanied by CO2 sorption into their internal structures in the presence of scCO2. Furthermore, the observed significant reduction in permeability cannot fully be explained by two model predictions based on Kozeney-Carman equation and Hagen-Poiseuille law, considering CO2 sorption onto mineral phases. The present results pointed out that CO2 sorption on rocks under geological CO2 storage conditions could have a significantly impact on flow property of rocks during CO2 injection and storage processes.

著者

後藤 敬一 渋江 隆雄 村上 健一

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.131, no.10_11, pp.553-558, 2015-10-01 (Released:2016-01-01)

参考文献数

1

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Caserones is the first world class copper mine owned and operated 100% by Japanese companies. It is an open pit mine located in the Andes, 160 km southeast of the city of Copiapó, Chile. The equity is shared by 2 Japanese companies, Pan Pacific Copper CO., LTD and Mitsui & CO., LTD. In May 2006, Pan Pacific Copper acquired the concession which includes Caserones as a supergene oxide and sulphide copper prospect. In pre-feasibility study stage, a significant hypogene sulfide ore was identified beneath it. The construction began in March 2010, and the SX-EW plant started operation in March 2013. In July 2014, at the beginning of copper concentrates production, the official opening ceremony was held in Santiago of Chile, with the attendance of Japanese Prime Minister Shinzo Abe and Chilean Mining Minister Aurora Williams. Caserones is estimated to embrace 1 billion tons of hypogene ore containing 0.34% of copper and 126ppm of molybdenum, besides 300 million tons of supergene ore with 0.25% of copper. The production is planned to last 28 years. Caserones will contribute to the stability of copper supply to Japan, as well to raising Japanese mining experts.

著者

坂田 章吉

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.7, pp.116-128, 2022-07-28 (Released:2022-07-28)

参考文献数

12

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The Federal Republic of Nigeria (herein after referred to as “Nigeria”) is the largest oil producing country in Africa and 13th in the world. However, community development is delayed especially in the Niger Delta where oil is produced. In this situation, many CSR community development projects of multi-national oil development companies (herein after referred to as “companies”) are implemented there.Frynas (2005) suggested that if the government’s community development (herein after referred to as “development”) is insufficient, people turn to companies for such development. It also suggested that, in general, CSR doesn’t succeed in its role, but if CSR were successful, this might ease the pressure on the government to undertake a development role.Sakata (2020) studied this by interviewing people in Nigeria, however, the sample size was not large enough and more study was required.In this study, Nigerian people in a sufficient sample size were interviewed to determine the ratio of people’s expectations of development by companies and government inside and outside of the Niger Delta, and the reasons for people’s expectations for each, in order to examine the factors of people’s high expectation for companies in the Niger Delta and occurrence of pressure reduction on the government.The study indicates that people’s expectation of development by companies is higher in the Niger Delta than in other areas, and that the most common reason for expectation of development by companies is “demand of compensation for using land and oil and causing environmental pollution in Nigeria by companies”, rather than “reliance on companies’ ability and resignation over the government’s inability to provide development”, which suggests that the factors of high expectation for the companies in the Niger Delta are the insufficient government’s development and the people’s idea that the companies should compensate to the communities and people who are suffered from the oil development in the Niger Delta. In addition, the study indicates that most people recognize that the government has a responsibility for development even though they expect development by companies, which suggests that the reduction in the pressure on the government is limited.

著者

亀山 正義 田原 康博 吉田 堯史 松浦 太一 宮吉 紗綾子

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.138, no.7, pp.103-115, 2022-07-28 (Released:2022-07-28)

参考文献数

19

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In some cases, mine drainage containing heavy metals (arsenic, cadmium, lead, and other metals) continues to flow out from mine mouths and accumulation sites in abandoned metal mines. The local governments that manage the abandoned mines continue to treat mine drainage water day and night. Therefore, practical and realistic measures to reduce the volume of mine drainage are required. A large amount of data on mine drainage has been accumulated for a long time at each mine. Also, several technologies have been introduced that make it possible to understand the actual hydrological water flow of mine drainage and to predict the quantitative effects of countermeasures. Under these circumstances, JOGMEC applied a surface water-groundwater coupled simulation technique to the old Matsuo Mine located in Hachimantai City, Iwate Prefecture. The simulation was used as a part of the results of the "Research and Study on Groundwater Control Technology" of the " Advanced Research and Study for Mine Drainage Treatment in Abandoned Mines Project", a project commissioned by the Ministry of Economy, Trade and Industry of Japan. It was confirmed that the existing countermeasures were efficient and effective under the limited budget. Thus, proving that it was the best practice.